[Minor] Do not pass hostname as IP to Lua

diff --git a/src/lua/lua_task.c b/src/lua/lua_task.c
index b7f636c37c03bf463a6e7d564bc08f19ed837264..9819c4eac8232e908cb65a4f60e4fcfe8993ab09 100644 (file)
--- a/src/lua/lua_task.c
+++ b/src/lua/lua_task.c
@@ -2926,7 +2926,7 @@ lua_task_get_hostname (lua_State *L)
                                 *  message sender's IP address enclosed in square
                                 *  brackets (e.g. `[a.b.c.d]')
                                 */
-                               lua_pushstring (L, "unknown");
+                               lua_pushnil (L);
                        }
                        else {
                                lua_pushstring (L, task->hostname);